2. Put in: who or which. 1. She returned me the disk ... I gave her yesterday. 2. Do you know the girl ... has won the first prize in the competition? 3. The mother tongue is a language ... a child learns naturally, in his/her family.

Решение:

Выбираем правильное относительное местоимение: who для людей, which для предметов и понятий.

1. She returned me the disk, which I gave her yesterday. (Диск — предмет)
2. Do you know the girl who has won the first prize in the competition? (Девушка — человек)
3. The mother tongue is a language which a child learns naturally, in his/her family. (Язык — понятие/система)

Ответ: 1. which; 2. who; 3. which